Joan Lunden, former host of ABC News' morning show Good Morning America, shared the news of her breast cancer diagnosis on Tuesday’s show.

Lunden co-hosted Good Morning America from 1980 to 1997, notes ABC News. Inspired by her father, who was a cancer surgeon, Lunden has been a health advocate since, and chose to share her diagnosis in order to inspire and reach other women who might be going through the same thing.

While Lunden’s original yearly mammogram came up clear, cancer was discovered in a routine ultrasound done later. In order to treat the cancer, she will have to go through radiation and surgery, and has already begun chemotherapy to fight the cancer, according to ABC News.

"I have covered many stories about breast cancer over the years but I never actually thought this would happen to me," Lunden said in a statement, reports Entertainment Tonight. "I have shaped my career around health & wellness advocacy so it seemed natural to share my story. I've started chemotherapy and while I don't know how I’ll look and feel down the road, I am assuming the best because that is how I live my life.”

She revealed the news to Robin Roberts, who is also a breast cancer survivor.